RFID - Elektor

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ISO/IEC 14443 Type A Card Activation 8.1 Figure 8.1. Smart Card Magic. NET allows card activation via the toolbar. Table 8.1. Single-size UID (4 bytes). Byte UID0 UID1 UID2 UID3 Value uu uu uu uu Table 8.2. Single-size RID (4 bytes). Byte Tag RID0 RID1 RID2 Value 0x08 rr rr rr Table 8.3. Double-size UID (7 bytes). Byte CT UID0 UID1 UID2 UID3 UID4 UID5 UID6 Value 0x88 MID uu uu uu uu uu uu copyright Elektor Table 8.4. Triple-size UID (10 bytes). Byte CT UID0 UID1 UID2 CT UID3 UID4 UID5 UID6 UID7 UID8 UID9 Value 0x88 MID uu uu 0x88 uu uu uu uu uu uu uu u – unique number r – random number MID – Manufacturer ID as per ISO/IEC 7816-6/AM1 (0x04 = NXP Semiconductors) CT – Cascade tag as per ISO/IEC 14443-3 With a randomly-generated card serial number, or a so-called Random ID (RID), the first byte’s value is always 0x08—this value indicates that it is an RID. During an Anti-collision or Select command, 4 bytes are always transferred. For cards with a double- or triple-size UID, this command sequence is issued two or three times in a row, or cascaded. The value of the command byte is identical for each Anti-collision and Select, although it differs by cascade level (Level 1 = 0x93; Level 2 = 0x95; Level 3 = 0x97). 229
9 Elektor RFID Projects Gerhard H. Schalk 9.1 Programming the MF RC522 Reader IC The MF RC522 reader IC is programmed and configured using a total of 48 special function registers (SFRs). A host computer can control the MF RC522 registers via RS-232, I 2 C or SPI interface. Selection of the serial interface is done with a voltage at the input pins I2C and EA (hardwired). In the Elektor RFID Reader (Figure 9.1), connection to the P89LPC396 microcontroller is done via I 2 C. copyright Elektor Figure 9.1. Elektor RFID Reader simplified block diagram. The Elektor RFID Reader’s firmware, that is, the P89LPC936 microcontroller program, supports the two stand-alone modes of operation, Terminal mode and Access Control mode, as well as a PC Reader mode. For performance reasons, the complex MF RC522 control software is implemented entirely in the reader firmware. In PC Reader mode, the communication with the card is always initiated by the PC. The PC sends a firmware command to the microcontroller via the FT232R USB-to-RS-232 converter. This calls the corresponding MF RC522 function. The MF RC522 registers are read and written via I 2 C. Writing and reading of card data always takes place through the 64-byte FIFO (first-in-first-out) buffer. By repeatedly writing to or reading from FI- FODataReg, data is transferred to or from the FIFO buffer. The generation of protocol frames, including CRC calculation, is carried out entirely by the contactless UART. RF modulation of the serial bit stream ultimately takes place in the analog interface. The demodulation and decoding of the card’s response also takes place in the analog sec- 385
Page 1 and 2: copyright Elektor
Page 3 and 4: Contents 2.1.4 Part 4: communicatio
Page 5 and 6: Contents 5 Introduction to Cards an
Page 7 and 8: Contents 7.6.2.2 A Scripting Tool o
Page 9 and 10: Contents 8.8.1.1 Class Byte (CLA) .
Page 11 and 12: Preface Dr. Thomas Wille RFID techn
Page 13 and 14: 5 Introduction to Cards and Tags Re
Page 15 and 16: Overview 5.1 A typical application
Page 17 and 18: MIFARE 5.2 MIFARE Classic chip and
Page 19: 8 Cards and Tags in Application 8.1
Page 23 and 24: Programming the MF RC522 Reader IC
Page 25: copyright Elektor

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